[libvirt] [PATCHv4 3/4] blkiotune: add interface for blkiotune.device_weight

[Daniel P. Berrange]

On Mon, Nov 14, 2011 at 09:30:01PM -0700, Eric Blake wrote:
> From: Hu Tao <hutao at cn.fujitsu.com>
> 
> This adds per-device weights to <blkiotune>.  Note that the
> cgroups implementation only supports weights per block device,
> and not per-file within the device; hence this option must be
> global to the domain definition rather than tied to individual
> <devices>/<disk> entries:
> 
> <domain ...>
>   <blkiotune>
>     <device>
>       <path>/path/to/block</path>
>       <weight>1000</weight>
>     </device>
>   </blkiotune>
> ..
> 
> This patch also adds a parameter --device-weights to virsh command
> blkiotune for setting/getting blkiotune.weight_device for any
> hypervisor that supports it.  All <device> entries under
> <blkiotune> are concatenated into a single string attribute under
> virDomain{Get,Set}BlkioParameters, named "device_weight".

I don't entirely like the concatenation of devices
into device_weight, but I don't see a good alternative
given the API design.

ACK

Daniel
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